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Value at Risk VaR

⬢ 層級 2技術
高
薪資影響
10 個月
學習時長
困難
難度
2
職業
一覽

Value at Risk (VaR) is a statistical measure of portfolio risk: the maximum loss under normal market conditions at a given confidence level (95%, 99%). Used by risk managers, traders, and financial institutions quantifying portfolio risk, setting risk limits, and stress-testing strategies. Salary: $120–180k. Learn in 10–14 weeks. Sits alongside Risk Management, Portfolio Theory, and Statistical Modeling.

什麼是 Value at Risk VaR

Value at Risk (VaR) is a statistical measure of portfolio risk: the maximum loss a portfolio is likely to suffer under normal market conditions at a given confidence level (e.g., 95%). If a portfolio has a 95% VaR of $1M, there's a 95% chance it won't lose more than $1M tomorrow (or chosen period). VaR quantifies risk; it helps risk managers set capital reserves and risk limits. You calculate VaR using market data, returns distributions, and statistical models. Common methods: historical simulation (use past returns), parametric (assume normal distribution), Monte Carlo (simulate thousands of scenarios).

🔧 工具與生態
Python for VaR modeling (NumPy, SciPy, pandas)Statistical software (R, STATA)Risk systems (RiskMetrics, Axioma, Numerix)Market data APIsExcel for modelingTime series analysis

💰 各地區薪資

地區初級中級高級
USA$100,000$160,000$250,000
UK£60,000£95,000£160,000
EU€68,000€105,000€175,000
CANADACA$95,000CA$150,000CA$240,000

🎯 使用 Value at Risk VaR 的職業

Product Manager
Risk Analyst

❓ 常見問題

What does '95% VaR of $1M' mean?
There's a 95% chance the portfolio won't lose more than $1M over the next day (or period). Conversely, 5% chance of losing MORE than $1M. Used to set capital reserves.
What are VaR methods: historical, parametric, Monte Carlo?
Historical: use past returns to estimate future losses. Parametric (variance-covariance): assume normal distribution; calculate based on mean/std dev. Monte Carlo: simulate thousands of scenarios. Each has pros/cons.
What's the difference between VaR and expected shortfall (CVaR)?
VaR = max loss at 95% confidence. Expected shortfall (CVaR) = average loss in worst 5% of cases. CVaR is more conservative, better for extreme risks.
Does VaR prevent losses?
No. VaR measures risk; it doesn't prevent losses. It helps set risk limits and capital reserves. Risk limits prevent exceeding your VaR threshold.
Can VaR models be wrong?
Yes. VaR assumes normal market conditions. Tail events (crashes, black swans) break assumptions. Stress testing and scenario analysis complement VaR.

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